# The LearningOnline Network with CAPA 
# edit mode helpers
# 3/20 Guy
package Apache::edit; 

use strict;
use Apache::lonnet;

# Global Vars
# default list of colors to use in editing
@Apache::edit::colorlist=('#ffffff','#ff0000','#00ff00','#0000ff','#0ff000','#000ff0','#f0000f');
# depth of nesting of edit
$Apache::edit::colordepth=0;

sub initialize_edit {
  $Apache::edit::colordepth=0;
}

sub tag_start {
  my ($target,$token,$description) = @_;
  my $result='';
  if ($target eq "edit") {
    my $tag=$token->[1];
    if (!$description) {
      $description=&Apache::lonxml::description($token);
      if (!$description) { $description="<$tag>"; }
    }
    $result.= &start_table($token)."<tr><td>$description</td>
<td>Delete".
  &deletelist($target,$token)
  ."</td>
<td>".
  &insertlist($target,$token).
    "</td>
</tr><tr><td colspan=\"3\">\n";
#<td>".
#  &movebuttons($target,$token).
#    "</tr><tr><td colspan=\"3\">\n";
  }
  return $result;
}

sub tag_end {
  my ($target,$token,$description) = @_;
  my $result='';
  if ($target eq 'edit') {
    my $tag=$token->[1];
    if (!defined($description)) {
      $result.="</td></tr><tr><td>&lt;/$tag&gt;</td><td colspan=\"2\">&nbsp;</td>";
    } else {
      if ($description ne '') { $result.="</td></tr><tr><td>$description</td><td colspan=\"2\">&nbsp;</td>"; }
    }
    $result.="</tr>".&end_table()."\n";
  }
  return $result;
}

sub start_table {
  my ($token)=@_;
  my $tag = $token->[1];
  my $tagnum;
  foreach my $namespace (reverse @Apache::lonxml::namespace) {
    my $testtag=$Apache::lonxml::namespace['-1'].'::'.$tag;
    $tagnum=$Apache::lonxml::insertlist{"$testtag.num"};
    if (defined($tagnum)) { last; }
  }
  if (!defined ($tagnum)) { $tagnum=$Apache::lonxml::insertlist{"$tag.num"}; }
  my $color = $Apache::lonxml::insertlist{"$tagnum.color"};
  if (!defined($color)) {
    $color = $Apache::edit::colorlist[$Apache::edit::colordepth];
  }
  $Apache::edit::colordepth++;
  my $result="<table bgcolor=\"$color\" width=\"100%\" border=\"5\">";
  return $result;
}

sub end_table {
  $Apache::edit::colordepth--;
  my $result="</table>";
  return $result;
}

sub movebuttons {
  my ($target,$token) = @_;
  my $result='<input type="submit" name="moveup.'.
    $Apache::lonxml::curdepth.'" value="Move Up" />';
  $result.='<input type="submit" name="movedown.'.
    $Apache::lonxml::curdepth.'" value="Move Down" />';
  return $result;
}

sub deletelist {
  my ($target,$token) = @_;
  my $result = "<select name=\"delete_$Apache::lonxml::curdepth\">
<option></option>
<option>Yes</option>
</select>";
  return $result;
}

sub handle_delete {
  if (!$ENV{"form.delete_$Apache::lonxml::curdepth"}) { return ''; }
  my ($space,$target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $result=0;
  if ($space) {
    my $sub1="$space\:\:delete_$token->[1]";
    {
      no strict 'refs';
      if (defined &$sub1) {
	$result=&$sub1($target,$token,$tagstack,$parstack,$parser,$safeeval,$style);
      }
    }
  }
  if (!$result) {
    my $endtag='/'.$token->[1];
    my $bodytext=&Apache::lonxml::get_all_text($endtag,$$parser[$#$parser]);
    $$parser['-1']->get_token();
    &Apache::lonxml::debug("Deleting :$bodytext: for $token->[1]");
    &Apache::lonxml::end_tag($tagstack,$parstack,$token);
  }
  return 1;
}

sub get_insert_list {
  my ($token) = @_;
  my $result='';
  my @tagnums= ();
  #&Apache::lonxml::debug("keys ".join("\n",sort(keys(%Apache::lonxml::insertlist))));
  if ($Apache::lonxml::insertlist{"$token->[1].which"}) {
    push (@tagnums, @{ $Apache::lonxml::insertlist{"$token->[1].which"} });
  }
  foreach my $namespace (@Apache::lonxml::namespace) {
    if ($Apache::lonxml::insertlist{"$namespace".'::'."$token->[1].which"}) {
      push (@tagnums, @{ $Apache::lonxml::insertlist{"$namespace".'::'."$token->[1].which"} });
    }
  }
  if (@tagnums) {
    foreach my $tagnum (@tagnums) {
      $result.='<option value="'.$tagnum.'">'.$Apache::lonxml::insertlist{"$tagnum.description"}."</option>\n";
    }
    if ($result) { $result='<option selected="on"></option>'.$result; }
  }
  return $result;
}

sub insertlist {
  my ($target,$token) = @_;
  my $result;
  if ($target eq 'edit') {
    my $optionlist= &get_insert_list($token);
    if ($optionlist) {
      $result = "Insert:
<select name=\"insert_$Apache::lonxml::curdepth\">
$optionlist
</select>"
    } else {
      $result="&nbsp;";
    }
  }
  return $result;
}

sub handle_insert {
  if ($ENV{"form.insert_$Apache::lonxml::curdepth"} eq '') { return ''; }
  my $result;
  my $tagnum = $ENV{"form.insert_$Apache::lonxml::curdepth"};
  my $func=$Apache::lonxml::insertlist{"$tagnum.function"};
  if ($func eq 'default') {
    my $newtag=$Apache::lonxml::insertlist{"$tagnum.tag"};
    my $namespace;
    if ($newtag =~ /::/) { ($namespace,$newtag) = split(/::/,$newtag); }
    $result.="\n<$newtag>\n</$newtag>";
  } else {
    if (defined(&$func)) {
      {
	no strict 'refs';
	$result.=&$func();
      }
    } else {
      my $newtag=$Apache::lonxml::insertlist{"$tagnum.tag"};
      &Apache::lonxml::error("Unable to insert tag $newtag, $func was not defined.");
    }
  }
  return $result;
}

sub insert_responseparam {
  return '
    <responseparam />';
}

sub insert_numericalresponse {
  return '
<numericalresponse answer="">
    <textline />
    <hintgroup>
    </hintgroup>
</numericalresponse>';
}

sub insert_stringresponse {
  return '
<stringresponse answer="" type="">
    <textline />
    <hintgroup>
    </hintgroup>
</stringresponse>';
}

sub insert_optionresponse {
  return '
<optionresponse max="10">
    <foilgroup options="">
    </foilgroup>
    <hintgroup>
    </hintgroup>
</optionresponse>';
}

sub insert_displayduedate { return '<displayduedate />'; }
sub insert_displaytitle   { return '<displaytitle />'; }
sub insert_hintpart {
  return '
<hintpart on="default">
    <startouttext/>
    <endouttext />
</hintpart>';
}

sub insert_numericalhint {
  return '
<numericalhint>
</numericalhint>';
}

sub editfield {
  my ($tag,$data,$description,$minwidth,$minheight)=@_;

  my $count=0;
  my $maxlength=-1;
  map { $count++;
	if (length($_) > $maxlength) { $maxlength = length ($_); }
      } split ("\n", $data);
  if ($maxlength > 80) { $maxlength = 80; }
  if ($maxlength < $minwidth) { $maxlength = $minwidth; }
  if ( $count < $minheight) { $count = $minheight; }
  if ($description) {
    $description="<br />".$description."<br />";
  }
  return "$description\n&nbsp;&nbsp;&nbsp;<textarea rows=\"$count\" cols=\"$maxlength\" name=homework_edit_".$Apache::lonxml::curdepth.">$data</textarea>\n";
#  return "<br />\n&lt;$tag&gt;<br />\n&nbsp;&nbsp;&nbsp;<textarea rows=\"$count\" cols=\"$maxlength\" name=homework_edit_".$Apache::lonxml::curdepth.">$data</textarea><br />\n&lt;/$tag&gt;<br />\n";
}

sub modifiedfield {
  my ($token) = @_;
  my $result;
#  foreach my $envkey (sort keys %ENV) {
#    &Apache::lonxml::debug("$envkey ---- $ENV{$envkey}");
#  }
#  &Apache::lonxml::debug("I want homework_edit_$Apache::lonxml::curdepth");
#  &Apache::lonxml::debug($ENV{"form.homework_edit_$Apache::lonxml::curdepth"});
  $result=$ENV{"form.homework_edit_$Apache::lonxml::curdepth"};
  if (defined $token) {
    if (defined $token->[4]) {
      $result=$token->[4].$result;
    } else {
      $result=$result.$token->[2];
    }
  }
  return $result;
}

sub insert_startouttext {
  return "<startouttext />\n<endouttext />";
}

sub insert_script {
  return "\n<script type=\"loncapa/perl\">\n</script>";
}

# Returns a 1 if the token has been modified and you should rebuild the tag
# side-effects, will modify the $token if new values are found
sub get_new_args {
  my ($token,$parstack,$safeeval,@args)=@_;
  my $rebuild=0;
  foreach my $arg (@args) {
    #just want the string that it was set to
    my $value=$token->[2]->{$arg};
    my $newvalue=$ENV{"form.$Apache::lonxml::curdepth.$arg"};
    &Apache::lonxml::debug(" for:$arg: cur is :$value: new is :$newvalue:");
    if ($value ne $newvalue) {
      $token->[2]->{$arg}=$newvalue;
      $rebuild=1;
    }
  }
  return $rebuild;
}

# looks for /> on start tags
sub rebuild_tag {
  my ($token) = @_;
  my $result;
  if ($token->[0] eq 'S') {
    $result = '<'.$token->[1];
    while (my ($key,$val)= each(%{$token->[2]})) {
      $val=~s:^\s+|\s+$::g;
      $val=~s:"::g; #"
      &Apache::lonxml::debug("setting :$key: to  :$val:");
      $result.=' '.$key.'="'.$val.'"';
    }
    if ($token->[4] =~ m:/>$:) {
      $result.=' />';
    } else {
      $result.='>';
    }
  } elsif ( $token->[0] eq 'E' ) {
    $result = '</'.$token->[1].'>';
  }
  return $result;
}

sub text_arg {
  my ($description,$name,$token,$size) = @_;
  my $result;
  if (!defined $size) { $size=20; }
  my $arg=$token->[2]{$name};
  $result=$description.'<input name="'."$Apache::lonxml::curdepth.$name".
    '" type="text" value="'.$arg.'" size="'.$size.'" />';
  return $result;
}

sub select_arg {
  my ($description,$name,$list,$token) = @_;
  my $result;
  my $optionlist="";
  my $selected=$token->[2]{$name};
  foreach my $option (@$list) {
    if ( $selected eq $option ) {
      $optionlist.="<option selected=\"on\">$option</option>\n";
    } else {
      $optionlist.="<option>$option</option>\n";
    }
  }
  $result.=$description.'<select name="'."$Apache::lonxml::curdepth.$name".'">
       '.$optionlist.'
      </select></td></tr><tr><td colspan="3">';
  return $result;
}

sub select_or_text_arg {
  my ($description,$name,$list,$token,$size) = @_;
  my $result;
  my $optionlist="";
  my $found=0;
  my $selected=$token->[2]{$name};
  foreach my $option (@$list) {
    if ( $selected eq $option ) {
      $optionlist.="<option selected=\"on\">$option</option>\n";
      $found=1;
    } else {
      $optionlist.="<option>$option</option>\n";
    }
  }
  $optionlist.="<option value=\"TYPEDINVALUE\">Type in value</option>\n";
  if ($found) {
    $result.=$description.'<select name="'."$Apache::lonxml::curdepth.$name".'">
       '.$optionlist.'
      </select></td></tr><tr><td colspan="3">';
  } else {
    $result.=&text_arg($description,$name,$token,$size);
  }
  return $result;
}
1;
__END__
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